CA Dynam for VSE User Guide

Using Other Software with CA Dynam/T
Note that the data set created by the above job stream must be entirely
contained on one tape volume. Multivolume data sets under CA Dynam/T's
control are not supported when using the RESTORE=STANDALONE option.
With Forced Label
Tape Support
You may choose to use Forced Label Tape support, instead of specifying
TAPEOPT=NOLABEL in the catalog definitions of LIBR data sets, with LIBR
files.
It lets you BACKUP and RESTORE a single (sub)library from a standard labeled
CA Dynam/T-controlled data set. For example:
// JOB BACKUP VERSION 2 LIBRARY TO CA Dynam/T CONTROLLED TAPE
// TLBL UOUT,'DATASET.NAME,H' /* CAT CONTROLLED WITH HOLD */
// EXEC PGM=TDYNASN /* ALLOW PREOPEN CHECKING */
// ASSGN SYSXXX,DUMMY
/*
// EXEC PGM=LIBR
BACKUP SUBLIB=XXX.XXXX TAPE=SYSXXX R=O /* SINGLE OBJECT ONLY */
/*
// MTC CCC,SYSXXX /* POSITION LAST TAPE VOLUME */
/&
Note that when producing a CA Dynam/T-controlled LIBR backup tape, as in
the previous example, the following conditions apply:
• Tape positioning through TLBL or catalog option will cause errors, because
positioning takes place at close, before the LIBR EOB record/file has been
written.
• Trailer labels are written at close, before the LIBR EOB record. This does
not interfere with the RESTORE of the backed up library but may affect
other LIBR functions.
• Multiple (sub)libraries cannot be written to one data set, because the DTF
in use has been modified to specify standard labels using Forced Label
Tape support. This means that trailer labels are written at CLOSE, which
occurs once for each (sub)library backed up.
LIBR backups of multiple (sub)libraries using Forced Label Tape support
will complete successfully, but the resulting backups cannot be restored!
Chapter 2: Maintaining Tape Files 2–79